This article examines those real estate investment trusts (REITs) that invest predominantly in mortgage-backed securities (MBS) and fund themselves with repurchase agreements (repos)---so-called mortgage REITS, or mREITs. mREITs grew quite rapidly after the financial crisis that began in 2008...

Regulators have expressed concern about the growth of a category of real estate investment trusts (REITs) that today invest primarily in mortgage-backed securities (MBS). These companies, known as mortgage REITs, or mREITs, have increased both in number and in asset size since the financial...

This paper examines the history of mREITs and their broader role in the REIT industry. Additionally, it reviews how mREITs operate, how they are regulated, the risks they face, how they manage these risks, and the dangers they pose for the broader financial system